Fix hardcoded_credentials rule to only match on more specific patterns

[ccojocar]

fixes #1001

[codecov-commenter]

Codecov Report

Patch coverage: 80.00% and no project coverage change.

Comparison is base (325eb19) 72.18% compared to head (4578111) 72.18%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1009   +/-   ##
=======================================
  Coverage   72.18%   72.18%           
=======================================
  Files          51       51           
  Lines        3635     3635           
=======================================
  Hits         2624     2624           
+ Misses        923      922    -1     
- Partials       88       89    +1     

Files Changed	Coverage Δ
rules/hardcoded_credentials.go	74.63% <80.00%> (ø)

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